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From "Renzo Scheffer" <renzo.schef...@gmx.de>
Subject AW: get terms by positions
Date Tue, 03 Oct 2006 10:14:03 GMT
I try to get back a list of all left or right neighbours of a searchterm.
Then I will count them to get back the Information, how often a specific
word is used as neighbour of the searchterm. I know that the results are
variable according to the used Analyzer/Filter. It's just an experiment and
first I'll try to find out if it is possible to do something like that with
Lucene.

Renzo

-----Ursprüngliche Nachricht-----
Von: Nicolas Lalevée [mailto:nicolas.lalevee@anyware-tech.com] 
Gesendet: Dienstag, 3. Oktober 2006 00:04
An: java-user@lucene.apache.org
Betreff: Re: get terms by positions

Le Lundi 02 Octobre 2006 23:06, Renzo Scheffer a écrit :
> Hi,
>
>
>
> can anybody be so kind to tell me if it is possible to search a Term by
its
> position?
>
>
>
> I search a term (for excample "soccer") and get back the DocId's and
> positions as follows:
>
>
>
>
>
> TermPositions termPos = reader.termPositions(new
> Term("contents","soccer"));
>
> while(termPos.next()){
>
> int freq = termPos.freq();
>
> for(int i=0; i<freq; i++){
>
>
>
>       int docNumber = termPos.doc();
>
>       int position = termPos.nextPosition();
>
> System.out.println("DocId: "+docNumber+"; Pos:"+position);
>
> }
>
>
>
>
>
>
>
> Output:
>
>
>
> DocId: 0; Pos: 1
>
> DocId: 0; Pos: 4
>
> DocId: 0; Pos: 7
>
> DocId: 1; Pos: 3
>
> DocId: 1; Pos: 7
>
>
>
> Now I try to get back terms, one position before/after "soccer". I
> considered to take the
>
> Position and increase or decrease it. But I can't find a way to get back a
> term, according to the given Position.
>
> Can anybody help me?
>

I think this is a non-sense to try to find a term. In Lucene, you search
with 
a term, you are not trying to get some. Basically, in Lucene, you have a
list 
of term pointing on documents, not the reverse.

Maybe if you explain why you are trying to do that, we can find a better way

to do it.

Nicolas

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